Similar Polyaboloes Tiling a Triangle

A polyabolo or polytan is a plane figure
formed by joining equal isosceles right triangles along equal edges.
A few polyaboloes can form an isosceles right triangle
by joining variously sized copies of themselves.
Here I show some examples.

The tilings shown use as few tiles as I know how,
and are not necessarily unique under this condition.
If you find a tiling with fewer tiles, please write.

Most of these solutions were found by Karl Scherer, who published
them in A
Puzzling Journey to the Reptiles in 1986.
The third hexabolo solution was found independently by Bryce Herdt in 2009.